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Trivia: This serial is the first of only two classic Doctor Who stories to be recorded entirely on film as opposed to videotape; this was an emergency measure necessitated by the unavailability of studios due to industrial action at the BBC. It was also the first ever Doctor Who adventure to be filmed in colour (contrary to popular myth, no 1960s episodes of Doctor Who were shot in colour).

(Part 4) After Omega takes off his mask and looks in the mirror, when he sees that his physical body doesn't exist he puts his mask back on and screams, but when he shouts, "If I exist only by my will, then my will is to destroy," Omega's mask pops up off his face, and we can see the actor's blackened face as he shouts the last bit of his dialogue.